I couldn't find a video for k2b either but it is just like k1b except that you're poking the needle into the knit fabric 2 rows below. make sure that the needle is going straight into the opening formed by the stitch and not into just the back loop of the stitch 2 rows below. Here's another video for k1b that shows that idea.
When you've got it right, the stitch will look like there are 2 additional strands of yarn sitting in back of it on the right needle.
Maybe a close-up photo of what you have now would help?